Local Security Policy: Unable to add a user

My Problem:
The problem is with the Local Security Policy. I am unable to add a user to "Act as part of the operating system" and "Log on as service" but I have added users to "Back up files and directories".

Symptoms:
The "Add Users or Group" button is disabled on "Act as part of the operating system" and "Log on as service".
These to policies have a different icon next to them. 2 computers with a piece of paper in-between them.

The icon you describe means the policy has been set at a higher level (OU, Site and/or Domain) and you are inheriting the setting. The fact that you can't add a user would indicate that it has been added with a no-override option.

Try running GPResult at a command line to see which policies are being applied to your machine. You will have to either change or remove the definition of that policy in order to change it via Local policy.

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